John Langdon (born April 19, 1946) is a self-taught painter and graphic designer, Langdon has free-lanced as a lettering artist and logo design specialist since 1976. He is very well known for his ambigrams, which he began developing in the late 1960s and early 70s. Langdon featured his ambigrams and his essays in his book Wordplay published in 1992.
Langdon is known mostly through his association with Dan Brown, and the novels The Da Vinci Code and Angels and Demons. The protagonist of these novels was named Robert Langdon as a tribute to Langdon.
Langdon is now a professor of typography and corporate identity at Drexel University in Philadelphia. He continues to do work on ambigrams, as well as paintings and fine art works that incorporate language, type and philosophy.
Logos by John Landon: